Metal-free catalysts derived from lignin for efficient wet peroxide oxidation
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abstract
In this work, a wheat and hemp lignin (Sarkanda, Granit S.A.) has been used as
raw material for the development of metal-free activated carbons. These materials
were tested in the catalytic wet peroxide oxidation (CWPO) of 4-nitrophenol (4-NP;
5 g L-1) during 24 h experiments conducted at relatively mild operating conditions
(p = 1 atm, t = 50 °C, pH = 3, catalyst load = 2.5 g L-1 and [H2O2]0 = 17.8 g L-1).
First, the lignin was carbonized under
N2 atmosphere followed by the activation
of the obtained non-porous carbon (LG)
under air atmosphere at different
temperatures (150 to 350 ºC), leading to the
generation of significant porosity.
